Since 31 January 2000, in the second room a part filled by the Christian Union. The group is composed of the members of the old groups RPF (reformatory political Federation) and REFORMED POLITICAL LEAGUE (Gpv). Since the elections of 1989 the groups already held joint meetings.
2002-2010 the Christian Union did in 2002 for the first time take part in the elections. Despite that the party was hoping for profit, lost 1 seat. In 2003 the party lost another seat, but the VVD and the CDA wanted anyway along with the ChristianUnion and SGP forms a Cabinet. It did not go through and eventually was chosen for D66. After 2003 the Christian Union knew his views. During a discussion on the European Constitution was the party against and became very well known. The party was for integration and immigration, the country which regularly for disagreement with Minister Rita Verdonk. The party organized actions. Including through these actions the Christian Union won a lot of seats during the municipal elections of 2006.
The party also won in 2006 a lot of seats during the elections for the second Chamber. Together with the CDA and the PvdA formed the Christian Union Cabinet. This ran not quite fast and good. The Christian Union had a number of conflicts with other parties.
2010-present during the elections for the City Council, the provincial Council and the House of representatives the party lost seats. Both for Rutte Cabinet I as Rutte Cabinet II helped the Christian Union to plan. During the elections to the European Parliament, the Christian Union, together with the SGP and won two seats. In 2015 the party got a new leader, Gert-Jan Segers.